﻿using System;
using System.IO;
using System.Text;
using System.Runtime.InteropServices;
using System.Security.Cryptography;

namespace Xin478.CSWork.Common
{    
	/// <summary> 
	/// 加密
	/// </summary> 
	public class AES
	{ 
		//默认密钥向量
		//private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
		private static byte[] Keys = { 0x41, 0x72, 0x65, 0x79, 0x6F, 0x75, 0x6D, 0x79, 0x53, 0x6E, 0x6F, 0x77, 0x6D, 0x61, 0x6E, 0x3F };

		public static string Encode(string encryptString, string encryptKey)
		{
            if (encryptKey.Length > 32) encryptKey = encryptKey.Substring(0, 32);
            else encryptKey = encryptKey.PadRight(32, ' ');

			RijndaelManaged rijndaelProvider = new RijndaelManaged();
			rijndaelProvider.Key = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 32));
			rijndaelProvider.IV = Keys;
			ICryptoTransform rijndaelEncrypt = rijndaelProvider.CreateEncryptor();
 
			byte[] inputData = Encoding.UTF8.GetBytes(encryptString);
			byte[] encryptedData = rijndaelEncrypt.TransformFinalBlock(inputData,0,inputData.Length);

			return Convert.ToBase64String(encryptedData);
		}

		public static string Decode(string decryptString, string decryptKey)
		{
			try
			{
                if (decryptKey.Length > 32) decryptKey = decryptKey.Substring(0, 32);
                else decryptKey = decryptKey.PadRight(32, ' ');

				RijndaelManaged rijndaelProvider = new RijndaelManaged();
				rijndaelProvider.Key = Encoding.UTF8.GetBytes(decryptKey);
				rijndaelProvider.IV = Keys;
				ICryptoTransform rijndaelDecrypt = rijndaelProvider.CreateDecryptor();
 
				byte[] inputData = Convert.FromBase64String(decryptString);
				byte[] decryptedData = rijndaelDecrypt.TransformFinalBlock(inputData,0,inputData.Length);

				return Encoding.UTF8.GetString(decryptedData);
			}
			catch
			{
				return "";
			}

		}

	}

	/// <summary> 
	/// 加密
	/// </summary> 
	public class DES
	{ 


		//默认密钥向量
		private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
		
		
		/// <summary>
		/// DES加密字符串
		/// </summary>
		/// <param name="encryptString">待加密的字符串</param>
		/// <param name="encryptKey">加密密钥,要求为8位</param>
		/// <returns>加密成功返回加密后的字符串,失败返回源串</returns>
		public static string Encode(string encryptString, string encryptKey)
		{
            if (encryptKey.Length > 8) encryptKey = encryptKey.Substring(0, 8);
            else encryptKey = encryptKey.PadRight(8, ' ');

			byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
			byte[] rgbIV = Keys;
			byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
			DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
			MemoryStream mStream = new MemoryStream();
			CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
			cStream.Write(inputByteArray, 0, inputByteArray.Length);
			cStream.FlushFinalBlock();
			return Convert.ToBase64String(mStream.ToArray());
		
		}

		/// <summary>
		/// DES解密字符串
		/// </summary>
		/// <param name="decryptString">待解密的字符串</param>
		/// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>
		/// <returns>解密成功返回解密后的字符串,失败返源串</returns>
		public static string Decode(string decryptString, string decryptKey)
		{
			try
			{
                if (decryptKey.Length > 8) decryptKey = decryptKey.Substring(0, 8);
                else decryptKey = decryptKey.PadRight(8, ' ');

				byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
				byte[] rgbIV = Keys;
				byte[] inputByteArray = Convert.FromBase64String(decryptString);
				DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
		
				MemoryStream mStream = new MemoryStream();
				CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
				cStream.Write(inputByteArray, 0, inputByteArray.Length);
				cStream.FlushFinalBlock();
				return Encoding.UTF8.GetString(mStream.ToArray());
			}
			catch
			{
				return "";
			}
		
		}


	}

    public class CRC32
    {
        static ulong[] crc32Table = {   
 0x0, 0x77073096, 0xee0e612c, 0x990951ba, 0x76dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,   
 0xedb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x9b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,   
 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,   
 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,   
 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,   
 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,   
 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,   
 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,   
 0x76dc4190, 0x1db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x6b6b51f, 0x9fbfe4a5, 0xe8b8d433,   
 0x7807c9a2, 0xf00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x86d3d2d, 0x91646c97, 0xe6635c01,   
 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,   
 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,   
 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,   
 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,   
 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,   
 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,   
 0xedb88320, 0x9abfb3b6, 0x3b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x4db2615, 0x73dc1683,   
 0xe3630b12, 0x94643b84, 0xd6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0xa00ae27, 0x7d079eb1,   
 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,   
 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,   
 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,   
 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,   
 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,   
 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,   
 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x26d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x5005713,   
 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0xcb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0xbdbdf21,   
 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,   
 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,   
 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,   
 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,   
 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,   
 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,   
};   
    
        /**/
        /// <summary>
        /// 字节数组效验
        /// </summary>
        /// <param name="buffer">ref 字节数组</param>
        /// <returns></returns>
        public static ulong ByteCRC(byte[] buffer)
        {
            ulong ulCRC = 0xffffffff;
            ulong len;
            len = (ulong)buffer.Length;
            for (ulong buffptr = 0; buffptr < len; buffptr++)
            {
                ulong tabPtr = ulCRC & 0xFF;
                tabPtr = tabPtr ^ buffer[buffptr];
                ulCRC = ulCRC >> 8;
                ulCRC = ulCRC ^ crc32Table[tabPtr];
            }
            return ulCRC ^ 0xffffffff;
        }


        /**/
        /// <summary>
        /// 字符串效验
        /// </summary>
        /// <param name="sInputString">字符串</param>
        /// <returns></returns>
        public static ulong StringCRC(string sInputString)
        {
            byte[] buffer = Encoding.Default.GetBytes(sInputString);
            return ByteCRC(buffer);
        }

        /**/
        /// <summary>
        /// 文件效验
        /// </summary>
        /// <param name="sInputFilename">输入文件</param>
        /// <returns></returns>
        public static ulong FileCRC(string sInputFilename)
        {
            FileStream inFile = new System.IO.FileStream(sInputFilename, System.IO.FileMode.Open, System.IO.FileAccess.Read);
            byte[] bInput = new byte[inFile.Length];
            inFile.Read(bInput, 0, bInput.Length);
            inFile.Close();

            return ByteCRC(bInput);
        }
    }

    /// <summary>
    /// MD5 无逆向编码
    /// 获取唯一特征串，可用于密码加密
    /// (无法还原)
    /// </summary>
    public class MD5
    {
        /// <summary>
        /// 获取字符串的特征串
        /// </summary>
        /// <param name="sInputString">输入文本</param>
        /// <returns></returns>
        public static string HashString(string sInputString)
        {
            System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create();
            string encoded = BitConverter.ToString(md5.ComputeHash(Encoding.Default.GetBytes(sInputString))).Replace("-", "");
            return encoded;
        }

        /// <summary>
        /// 获取文件的特征串
        /// </summary>
        /// <param name="sInputFilename">输入文件</param>
        /// <returns></returns>
        public static string HashFile(string filepath)
        {
            if (!File.Exists(filepath)) return null;

            System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create();
            FileStream inFile = new System.IO.FileStream(filepath, System.IO.FileMode.Open, System.IO.FileAccess.Read);
            byte[] bInput = new byte[inFile.Length];
            inFile.Read(bInput, 0, bInput.Length);
            inFile.Close();

            return BitConverter.ToString(md5.ComputeHash(bInput)).Replace("-", "");
        }
    }

  /// <summary>
  /// Base64 UUEncoded 编码
  /// 将二进制编码为ASCII文本，用于网络传输
  /// (可还原)
  /// </summary>
  public class BASE64
  {
      /**/
      /// <summary>
      /// DES 加密
      /// 支持Key(钥匙)加密变化
      /// 支持还原
      /// 
      /// 演示操作：
      ///  // 64位，8个字节
      ///  string sSecretKey;
      ///
      ///  // 获取Key
      ///  sSecretKey = GenerateKey();
      ///
      ///  // 托管
      ///  GCHandle gch = GCHandle.Alloc( sSecretKey,GCHandleType.Pinned );
      ///
      ///  // 加密文件
      ///  EncryptFile(@"C:MyData.txt",
      ///  @"C:Encrypted.txt",
      ///  sSecretKey);
      ///
      ///  // 解密文件
      ///  DecryptFile(@"C:Encrypted.txt",
      ///  @"C:Decrypted.txt",
      ///  sSecretKey);
      ///
      ///  // 释放托管内容
      ///  ZeroMemory(gch.AddrOfPinnedObject(), sSecretKey.Length * 2);
      ///  gch.Free();
      /// </summary>
      public class DES
      {
          [DllImport("KERNEL32.DLL", EntryPoint = "RtlZeroMemory")]
          public static extern bool ZeroMemory(IntPtr Destination, int Length);

          public DES()
          {
              //
              // TODO: 在此处添加构造函数逻辑
              //
          }

          /**/
          /// <summary>
          /// 创建Key
          /// </summary>
          /// <returns></returns>
          public string GenerateKey()
          {
              // 创建一个DES 算法的实例。自动产生Key
              DESCryptoServiceProvider desCrypto = (DESCryptoServiceProvider)DESCryptoServiceProvider.Create();

              // 返回自动创建的Key 用于加密
              return ASCIIEncoding.ASCII.GetString(desCrypto.Key);
          }

          /**/
          /// <summary>
          /// 加密字符串
          /// </summary>
          /// <param name="sInputString">输入字符</param>
          /// <param name="sKey">Key</param>
          /// <returns>加密结果</returns>
          public string EncryptString(string sInputString, string sKey)
          {
              byte[] data = Encoding.Default.GetBytes(sInputString);
              byte[] result;
              DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
              DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
              DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
              ICryptoTransform desencrypt = DES.CreateEncryptor();
              result = desencrypt.TransformFinalBlock(data, 0, data.Length);

              string desString = "";
              for (int i = 0; i < result.Length; i++)
              {
                  desString += result[i].ToString() + "-";
              }

              //return desString.TrimEnd('-');
              return BitConverter.ToString(result);
          }

          /**/
          /// <summary>
          /// 解密字符串
          /// </summary>
          /// <param name="sInputString">输入字符</param>
          /// <param name="sKey">Key</param>
          /// <returns>解密结果</returns>
          public string DecryptString(string sInputString, string sKey)
          {
              string[] sInput = sInputString.Split("-".ToCharArray());
              byte[] data = new byte[sInput.Length];
              byte[] result;
              for (int i = 0; i < sInput.Length; i++)
                  data[i] = byte.Parse(sInput[i], System.Globalization.NumberStyles.HexNumber);

              DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
              DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
              DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
              ICryptoTransform desencrypt = DES.CreateDecryptor();
              result = desencrypt.TransformFinalBlock(data, 0, data.Length);
              return Encoding.Default.GetString(result);
          }

          /**/
          /// <summary>
          /// 加密文件
          /// </summary>
          /// <param name="sInputFilename">输入文件</param>
          /// <param name="sOutputFilename">输出文件</param>
          /// <param name="sKey">Key</param>
          public void EncryptFile(string sInputFilename,
            string sOutputFilename,
            string sKey)
          {
              FileStream fsInput = new FileStream(sInputFilename,
                FileMode.Open,
                FileAccess.Read);

              FileStream fsEncrypted = new FileStream(sOutputFilename,
                FileMode.Create,
                FileAccess.Write);
              DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
              DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
              DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
              ICryptoTransform desencrypt = DES.CreateEncryptor();
              CryptoStream cryptostream = new CryptoStream(fsEncrypted,
                desencrypt,
                CryptoStreamMode.Write);

              byte[] bytearrayinput = new byte[fsInput.Length];
              fsInput.Read(bytearrayinput, 0, bytearrayinput.Length);
              cryptostream.Write(bytearrayinput, 0, bytearrayinput.Length);
              cryptostream.Close();
              fsInput.Close();
              fsEncrypted.Close();
          }

          /**/
          /// <summary>
          /// 解密文件
          /// </summary>
          /// <param name="sInputFilename">输入文件</param>
          /// <param name="sOutputFilename">输出文件</param>
          /// <param name="sKey">Key</param>
          public void DecryptFile(string sInputFilename,
            string sOutputFilename,
            string sKey)
          {
              DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
              DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
              DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);

              FileStream fsread = new FileStream(sInputFilename,
                FileMode.Open,
                FileAccess.Read);
              ICryptoTransform desdecrypt = DES.CreateDecryptor();
              CryptoStream cryptostreamDecr = new CryptoStream(fsread,
                desdecrypt,
                CryptoStreamMode.Read);
              StreamWriter fsDecrypted = new StreamWriter(sOutputFilename);
              fsDecrypted.Write(new StreamReader(cryptostreamDecr).ReadToEnd());
              fsDecrypted.Flush();
              fsDecrypted.Close();
          }

      }
  }
}

